Mantle

Definition:

(n.) A loose garment to be worn over other garments; an enveloping robe; a cloak. Hence, figuratively, a covering or concealing envelope.
(n.) Same as Mantling.
(n.) The external fold, or folds, of the soft, exterior membrane of the body of a mollusk. It usually forms a cavity inclosing the gills. See Illusts. of Buccinum, and Byssus.
(n.) Any free, outer membrane.
(n.) The back of a bird together with the folded wings.
(n.) A mantel. See Mantel.
(n.) The outer wall and casing of a blast furnace, above the hearth.
(n.) A penstock for a water wheel.
(v. t.) To cover or envelop, as with a mantle; to cloak; to hide; to disguise.
(v. i.) To unfold and spread out the wings, like a mantle; -- said of hawks. Also used figuratively.
(v. i.) To spread out; -- said of wings.
(v. i.) To spread over the surface as a covering; to overspread; as, the scum mantled on the pool.
(v. i.) To gather, assume, or take on, a covering, as froth, scum, etc.